I'll say

Idioms  

1. Absolutely, I strongly agree. For example, Did you enjoy the film?—I'll say. This phrase is generally used alone and for emphasis. [First half of 1900s] For a synonym, see you can say that again.

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Example Sentences

“And I’ll say that he still feels his command wasn’t up to par, but given the Tommy John and what typically command looks like the year after, it was above that. So, I think that was impressive. Just his ability to command the couple different breaking balls, to change the shape of his breaking balls was pretty impressive, and everything he does is with a purpose. So, I’m really excited to see with the full offseason and to just prepare and not rehab, what he can do this year.”

From Los Angeles Times

I’ll say this, it’s Jeff’s show, you know, maybe ask him.

From Los Angeles Times

Then, wherever I am, sitting in the old tree up on the mountain or building a dam in the brook, I’ll say, “Well, that’s me. Guess I’ll get going.”

From Literature

Chabria: I certainly don’t care to predict, but I’ll say this: We may not need or get another Terminator.

From Los Angeles Times

I’ll say Nadal and you’ll scream “Boris Becker!”

From The Wall Street Journal